为何这段Python日期选择代码陷入无限循环？如何解决？

核心问题：类型不匹配 #

你的代码中year是整数类型（2023），但从页面获取的yr是字符串类型（比如"2023"），整数与字符串直接比较永远不相等，导致循环终止条件mon == month and yr == year永远无法满足，进而陷入无限循环。

修复方法二选一：

1. 将year定义为字符串：

   year = "2023"
   

2. 将获取的yr转为整数：

   yr = int(driver.find_element(By.XPATH, "//span[@class='ui-datepicker-year']").text)
   

额外优化点：避免无效点击与元素稳定性 #

• 判断点击方向：如果目标年月在当前显示的年月之前，点击下一页按钮（a[2]）会让日期越来越远，同样导致循环。可以先判断年月关系，选择点击上一页或下一页：

  import calendar
  
  # ... 其他代码 ...
  while True:
      mon = driver.find_element(By.XPATH, "//span[@class='ui-datepicker-month']").text
      yr = driver.find_element(By.XPATH, "//span[@class='ui-datepicker-year']").text
      print(mon, yr)
      
      current_year = int(yr)
      current_month = list(calendar.month_name).index(mon)
      target_year = int(year) if isinstance(year, int) else int(year)
      target_month = list(calendar.month_name).index(month)
      
      if current_year == target_year and current_month == target_month:
          break
      elif current_year < target_year or (current_year == target_year and current_month < target_month):
          # 点击下一页
          driver.find_element(By.XPATH, "//*[@id='ui-datepicker-div']/div/a[2]/span").click()
      else:
          # 点击上一页
          driver.find_element(By.XPATH, "//*[@id='ui-datepicker-div']/div/a[1]/span").click()
  

• 加入显式等待：避免页面未加载完成就获取元素，导致元素定位失败或 stale 异常：

  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.support import expected_conditions as EC
  
  # ... 其他代码 ...
  while True:
      # 等待月份元素可见后再获取文本
      mon = WebDriverWait(driver, 10).until(
          EC.visibility_of_element_located((By.XPATH, "//span[@class='ui-datepicker-month']"))
      ).text
      # 等待年份元素可见后再获取文本
      yr = WebDriverWait(driver, 10).until(
          EC.visibility_of_element_located((By.XPATH, "//span[@class='ui-datepicker-year']"))
      ).text
      print(mon, yr)
      
      if mon == month and (yr == str(year) if isinstance(year, int) else yr == year):
          break
      # ... 点击逻辑 ...
  

内容的提问来源于stack exchange，提问作者Sudarshan Kr. Suman